extern char c;

int main() {
	int i = 0;
	switch(c) {
		case 'A' :
			i = 10;
			break;
		case 'B' :
		case 'C' :
			i = 20;
			break;
		case 'D' :
			i = 30;
		default: 
			i = -1;
	}
	return 0;
}